External Wall

[D4N1EL]

Hi,
Last year i painted 2 external wall, 3 coats on each wall. I have noticed today its stated to flake and crack. What did i do wrong?

 

[madder]

Preparation perhaps? Did you use a decorators knife and possibly wire brush to remove any flaking, or pre flaking? Also, with the first, and even second coat, I would recommend Owatrol paint additive(or similar alternative) to help prevent damp or mould and flake.

 

[TheDec]

Did you apply your paint over a painted surface or bare masonry, and did you in in anyway thin your paint system prior to application?

Dec

 

[D4N1EL]

hi,
i painted a bare maisonary wall, with normal paint, didnt knowingly thin it anyway.

 

[TheDec]

Then that would be the probable cause of your problem, it is imperative that when you paint bare masonry that your first coat is thinned around 10%. This allows the desired penatration to ensure a good bond is established in order to promote the adhesion of further coats.

Dec

 

[vibrobullit407]

What was the masonry like before you applied your paint? Was is powdery before you painted? It may be that you should have used a stabilizing primer prior to your masonry paint.

 

[D4N1EL]

hi,
it was just a normal concrete wall in the garden, i gave it 3 coats. Can i use stabilizing fluid over the paint or do i scrape if off and start again?

 

[joe-90]

Give it a good wire brushing then do as Dec says.

Oh hang on you say it's a garden wall? Not part of the house with a damp course?

You won't get anything to stick to that for long due to hydrostatic pressure.

 

[libby lou lou]

Hi,
Last year i painted 2 external wall, 3 coats on each wall. I have noticed today its stated to flake and crack. What did i do wrong?

You moved to lpool your neighbours are trying to pinch it, and don't mention crack.